I tested a bunch of stuff the last couple summers. I'm sure you can find them if you search my posts. If you want to see all the pics. None of the oils I tested held up very well...I was leaving steel out in the elements, the first rain would do most of them in. Frog lube and a beeswax/coconut oil mix I made were consistently the best. Burts bees lip balm also worked well, but didn't last quit as long.